Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/89995 |
Resumo: | HR1217 is a prototypical rapidly oscillating Ap star that has presented a test to the theory of non-radial stellar pulsation. Prior observations showed a clear pattern of five modes with alternating frequency spacings of 33.3 and 34.6 μmHz, with a sixth mode at a problematic spacing of 50.0 μHz (which equals 1.5 x 33.3 μHz) to the high-frequency side. Asymptotic pulsation theory allowed for a frequency spacing of 34 μHz, but Hipparcos observations rule out such a spacing. Theoretical calculations of magnetoacoustic modes in Ap stars by Cunha predicted that there should be a previously undetected mode 34 μHz higher than the main group, with a smaller spacing between it and the highest one. In this Letter, we present preliminary results from a multisite photometric campaign on the rapidly oscillating Ap star HR1217 using the ‘Whole Earth Telescope’. While a complete analysis of the data will appear in a later paper, one outstanding result from this run is the discovery of a newly detected frequency in the pulsation spectrum of this star, at the frequency predicted by Cunha. |
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Kurtz, Donald W.Kawaler, Steven D.Riddle, Reed L.Reed, M. D.Cunha, Margarida S.Wood, Matthew A.Silvestri, Nicole M.Watson, Todd K.Dolez, NoëlMoskalik, PawelZola, StaszekPallier, E.Guzik, Joyce AnnMetcalfe, Travis S.Mukadam, Anjum ShaguftaNather, R. EdwardWinget, Donald EarlSullivan, Denis J.Sullivan, TerrySekiguchi, KazuhiroJiang, XiaojunShobbrook, Robert R.Ashoka, B.N.Seetha, S.Joshi, SantoshO'Donoghue, DarraghHandler, GeraldMueller, M.Gonzalez Perez, Jose MiguelSolheim, Jan-EricJohannessen, F.Ulla, AnaKepler, Souza OliveiraKanaan Neto, Antonio NemerCosta, Alex Fabiano Murillo daFraga, LucianoGiovannini Junior, OdilonMatthews, Jaymie M.WET collaboration2014-03-29T01:51:50Z20020035-8711http://hdl.handle.net/10183/89995000312245HR1217 is a prototypical rapidly oscillating Ap star that has presented a test to the theory of non-radial stellar pulsation. Prior observations showed a clear pattern of five modes with alternating frequency spacings of 33.3 and 34.6 μmHz, with a sixth mode at a problematic spacing of 50.0 μHz (which equals 1.5 x 33.3 μHz) to the high-frequency side. Asymptotic pulsation theory allowed for a frequency spacing of 34 μHz, but Hipparcos observations rule out such a spacing. Theoretical calculations of magnetoacoustic modes in Ap stars by Cunha predicted that there should be a previously undetected mode 34 μHz higher than the main group, with a smaller spacing between it and the highest one. In this Letter, we present preliminary results from a multisite photometric campaign on the rapidly oscillating Ap star HR1217 using the ‘Whole Earth Telescope’. While a complete analysis of the data will appear in a later paper, one outstanding result from this run is the discovery of a newly detected frequency in the pulsation spectrum of this star, at the frequency predicted by Cunha.application/pdfengMonthly notices of the Royal Astronomical Society. Oxford. Vol. 330, no. 3 (Mar. 2002), p. L57-L61Estrelas magneticasFotometria estelarPulsacoes estelaresEstrelas variaveisStars: individual: HR1217Stars: magnetic fieldsStars: oscillationsStars: variables: otherDiscovery of the 'missing' mode in HR 1217 by the Whole Earth TelescopeEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000312245.pdf000312245.pdfTexto completo (inglês)application/pdf176572http://www.lume.ufrgs.br/bitstream/10183/89995/1/000312245.pdf5947f55b14724b9c58ad2c5f2ea78617MD51TEXT000312245.pdf.txt000312245.pdf.txtExtracted Texttext/plain26116http://www.lume.ufrgs.br/bitstream/10183/89995/2/000312245.pdf.txt4c480a7dda819abbd965bddb8f940ae6MD52THUMBNAIL000312245.pdf.jpg000312245.pdf.jpgGenerated Thumbnailimage/jpeg1585http://www.lume.ufrgs.br/bitstream/10183/89995/3/000312245.pdf.jpg0687891962831b214c1acdeff498d44dMD5310183/899952018-10-18 09:07:27.322oai:www.lume.ufrgs.br:10183/89995Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-18T12:07:27Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope |
title |
Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope |
spellingShingle |
Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope Kurtz, Donald W. Estrelas magneticas Fotometria estelar Pulsacoes estelares Estrelas variaveis Stars: individual: HR1217 Stars: magnetic fields Stars: oscillations Stars: variables: other |
title_short |
Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope |
title_full |
Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope |
title_fullStr |
Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope |
title_full_unstemmed |
Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope |
title_sort |
Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope |
author |
Kurtz, Donald W. |
author_facet |
Kurtz, Donald W. Kawaler, Steven D. Riddle, Reed L. Reed, M. D. Cunha, Margarida S. Wood, Matthew A. Silvestri, Nicole M. Watson, Todd K. Dolez, Noël Moskalik, Pawel Zola, Staszek Pallier, E. Guzik, Joyce Ann Metcalfe, Travis S. Mukadam, Anjum Shagufta Nather, R. Edward Winget, Donald Earl Sullivan, Denis J. Sullivan, Terry Sekiguchi, Kazuhiro Jiang, Xiaojun Shobbrook, Robert R. Ashoka, B.N. Seetha, S. Joshi, Santosh O'Donoghue, Darragh Handler, Gerald Mueller, M. Gonzalez Perez, Jose Miguel Solheim, Jan-Eric Johannessen, F. Ulla, Ana Kepler, Souza Oliveira Kanaan Neto, Antonio Nemer Costa, Alex Fabiano Murillo da Fraga, Luciano Giovannini Junior, Odilon Matthews, Jaymie M. WET collaboration |
author_role |
author |
author2 |
Kawaler, Steven D. Riddle, Reed L. Reed, M. D. Cunha, Margarida S. Wood, Matthew A. Silvestri, Nicole M. Watson, Todd K. Dolez, Noël Moskalik, Pawel Zola, Staszek Pallier, E. Guzik, Joyce Ann Metcalfe, Travis S. Mukadam, Anjum Shagufta Nather, R. Edward Winget, Donald Earl Sullivan, Denis J. Sullivan, Terry Sekiguchi, Kazuhiro Jiang, Xiaojun Shobbrook, Robert R. Ashoka, B.N. Seetha, S. Joshi, Santosh O'Donoghue, Darragh Handler, Gerald Mueller, M. Gonzalez Perez, Jose Miguel Solheim, Jan-Eric Johannessen, F. Ulla, Ana Kepler, Souza Oliveira Kanaan Neto, Antonio Nemer Costa, Alex Fabiano Murillo da Fraga, Luciano Giovannini Junior, Odilon Matthews, Jaymie M. WET collaboration |
author2_role |
author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Kurtz, Donald W. Kawaler, Steven D. Riddle, Reed L. Reed, M. D. Cunha, Margarida S. Wood, Matthew A. Silvestri, Nicole M. Watson, Todd K. Dolez, Noël Moskalik, Pawel Zola, Staszek Pallier, E. Guzik, Joyce Ann Metcalfe, Travis S. Mukadam, Anjum Shagufta Nather, R. Edward Winget, Donald Earl Sullivan, Denis J. Sullivan, Terry Sekiguchi, Kazuhiro Jiang, Xiaojun Shobbrook, Robert R. Ashoka, B.N. Seetha, S. Joshi, Santosh O'Donoghue, Darragh Handler, Gerald Mueller, M. Gonzalez Perez, Jose Miguel Solheim, Jan-Eric Johannessen, F. Ulla, Ana Kepler, Souza Oliveira Kanaan Neto, Antonio Nemer Costa, Alex Fabiano Murillo da Fraga, Luciano Giovannini Junior, Odilon Matthews, Jaymie M. WET collaboration |
dc.subject.por.fl_str_mv |
Estrelas magneticas Fotometria estelar Pulsacoes estelares Estrelas variaveis |
topic |
Estrelas magneticas Fotometria estelar Pulsacoes estelares Estrelas variaveis Stars: individual: HR1217 Stars: magnetic fields Stars: oscillations Stars: variables: other |
dc.subject.eng.fl_str_mv |
Stars: individual: HR1217 Stars: magnetic fields Stars: oscillations Stars: variables: other |
description |
HR1217 is a prototypical rapidly oscillating Ap star that has presented a test to the theory of non-radial stellar pulsation. Prior observations showed a clear pattern of five modes with alternating frequency spacings of 33.3 and 34.6 μmHz, with a sixth mode at a problematic spacing of 50.0 μHz (which equals 1.5 x 33.3 μHz) to the high-frequency side. Asymptotic pulsation theory allowed for a frequency spacing of 34 μHz, but Hipparcos observations rule out such a spacing. Theoretical calculations of magnetoacoustic modes in Ap stars by Cunha predicted that there should be a previously undetected mode 34 μHz higher than the main group, with a smaller spacing between it and the highest one. In this Letter, we present preliminary results from a multisite photometric campaign on the rapidly oscillating Ap star HR1217 using the ‘Whole Earth Telescope’. While a complete analysis of the data will appear in a later paper, one outstanding result from this run is the discovery of a newly detected frequency in the pulsation spectrum of this star, at the frequency predicted by Cunha. |
publishDate |
2002 |
dc.date.issued.fl_str_mv |
2002 |
dc.date.accessioned.fl_str_mv |
2014-03-29T01:51:50Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/89995 |
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0035-8711 |
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000312245 |
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http://hdl.handle.net/10183/89995 |
dc.language.iso.fl_str_mv |
eng |
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eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Monthly notices of the Royal Astronomical Society. Oxford. Vol. 330, no. 3 (Mar. 2002), p. L57-L61 |
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openAccess |
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